Importing a Json file using script task in SSIS

Question

I am new to importing API's using script task in SSIS. I have to manage the import of a straightforward API JSON file but this second API JSON file is a bit tricky. I have been looking at the code and just don't know what I'm doing wrong.

My JSON file has a header which I need to determine how many pages of the API I need to loop through to get the data, but where I'm lost is, how do you import the next bit of data. I think I am close but since I'm new to this I could do it with a bit of guidance.

My code in the script task below, the have seen the stream reader import the data but I do not what use (eg List, class or dictionary)to import the countIn , countOut , etc columns.

    try
        {
            //Call getWebServiceResult to return our WorkGroupMetric array
            WorkGroupMetric[] outPutMetrics = GetWebServiceResult(wUrl);

            //For each group of metrics output records
            foreach (var metric in outPutMetrics)
            {
                APIBuffer.AddRow();
                APIBuffer.count = metric.count;
                APIBuffer.currentpage =  metric.currentpage;
                APIBuffer.totalpages = metric.totalpages;
                APIBuffer.countIn = metric.result.countIn;
                APIBuffer.countOut = metric.result.countOut;
                APIBuffer.type = metric.result.type;
                APIBuffer.countLine = metric.result.countLine;
                APIBuffer.from = metric.result.from;
                APIBuffer.to = metric.result.to;
            }

        }
        catch (Exception e)
        {
            FailComponent(e.ToString());
        }
    }

    private WorkGroupMetric[] GetWebServiceResult(string wUrl)
    {
        HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(wUrl);
        HttpWebResponse httpWResp = (HttpWebResponse)httpWReq.GetResponse();
        WorkGroupMetric[] jsonResponse = null;
        try
        {
            //Test the connection
            if (httpWResp.StatusCode == HttpStatusCode.OK)
            {

                Stream responseStream = httpWResp.GetResponseStream();
                string jsonString = null;

                //Set jsonString using a stream reader
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    jsonString = reader.ReadToEnd().Replace("\\", "");
                    reader.Close();
                }

                //Deserialize our JSON
                JavaScriptSerializer sr = new JavaScriptSerializer();
                //JSON string comes in with a leading and trailing " that need to be removed for parsing to work correctly
                //The JSON here is serialized weird, normally you would not need this trim
                jsonResponse = sr.Deserialize<WorkGroupMetric[]>(jsonString.Trim('"'));

            }
            //Output connection error message
            else
            {
                FailComponent(httpWResp.StatusCode.ToString());

            }
        }

        //Output JSON parsing error
        catch (Exception e)
        {
            FailComponent(e.ToString());
        }
        return jsonResponse;

        throw new NotImplementedException();
    }

    private void FailComponent(string errorMsg)
    {
        bool fail = false;
        IDTSComponentMetaData100 compMetadata = this.ComponentMetaData;
        compMetadata.FireError(1, "Error Getting Data From Webservice!", errorMsg, "", 0, out fail);

    }
}
//Class to hold our workgroup metrics
class WorkGroupMetric
{
    public string count { get; set; }
    public string currentpage { get; set; }
    public string totalpages  { get; set; }
    public List<Result> result { get; set; }   

}

class Result
{
    public string countIn { get; set; }
    public string countOut { get; set; }
    public string type { get; set; }
    public string countLine { get; set; }
    public string from { get; set; }
    public string to { get; set; }

}

Answer 1

So I have got the code working, posting it so t can help someone in the future.

   try
        {
            //Call getWebServiceResult to return our WorkGroupMetric array
            WorkGroupMetric outPutMetrics = GetWebServiceResult(wUrl);

            //For each group of metrics output records
            //foreach (var metric in outPutMetrics)
            //{


            var ts = outPutMetrics.results;

            totalcount = Int32.Parse(outPutMetrics.count);

            foreach (var a in ts)
            {
                Output0Buffer.AddRow();
                //Output0Buffer.count = outPutMetrics.count;
                
                Output0Buffer.countIn = a.countIn;
                Output0Buffer.countOut = a.countOut;
                Output0Buffer.type = a.type;
                Output0Buffer.countLine = a.countLine;
                Output0Buffer.from = a.from;
                Output0Buffer.to = a.to;

                i = i + 1;
            }

            Console.Write(i);
        }
        catch (Exception e)
        {
            FailComponent(e.ToString());
        }
    }

    private WorkGroupMetric GetWebServiceResult(string wUrl)
    {
        HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(wUrl);
        HttpWebResponse httpWResp = (HttpWebResponse)httpWReq.GetResponse();
        WorkGroupMetric jsonResponse = null;
        try
        {
            //Test the connection
            if (httpWResp.StatusCode == HttpStatusCode.OK)
            {

                Stream responseStream = httpWResp.GetResponseStream();
                string jsonString = null;

                //Set jsonString using a stream reader
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    jsonString = reader.ReadToEnd().Replace("\\", "");
                    reader.Close();
                }

                //Deserialize our JSON
                JavaScriptSerializer sr = new JavaScriptSerializer();
                //JSON string comes in with a leading and trailing " that need to be removed for parsing to work correctly
                //The JSON here is serialized weird, normally you would not need this trim
                jsonResponse = sr.Deserialize<WorkGroupMetric>(jsonString.Trim('"'));

            }
            //Output connection error message
            else
            {
                FailComponent(httpWResp.StatusCode.ToString());

            }
        }

        //Output JSON parsing error
        catch (Exception e)
        {
            FailComponent(e.ToString());
        }
        return jsonResponse;

        throw new NotImplementedException();
    }

    private void FailComponent(string errorMsg)
    {
        bool fail = false;
        IDTSComponentMetaData100 compMetadata = this.ComponentMetaData;
        compMetadata.FireError(1, "Error Getting Data From Webservice!", errorMsg, "", 0, out fail);

    }
}
//Class to hold our work group metrics
class WorkGroupMetric
{
    public string count { get; set; }
    public string currentpage { get; set; }
    public string totalpages { get; set; }
    public Result[] results { get; set; }

}

class Result
{
    public string countIn { get; set; }
    public string countOut { get; set; }
    public string type { get; set; }
    public string countLine `enter code here`{ get; set; }
    public string from { get; set; }
    public string to { get; set; }

}

Answer 2

Going by this example

https://www.tomasvera.com/programming/using-javascriptserializer-to-parse-json-objects/

Possibly this should be your C# class definition, using an array not a List

class WorkGroupMetric
{
    public string count { get; set; }
    public string currentpage { get; set; }
    public string totalpages  { get; set; }
    public Result[] results { get; set; }   

}

class Result
{
    public string countIn { get; set; }
    public string countOut { get; set; }
    public string type { get; set; }
    public string countLine { get; set; }
    public string from { get; set; }
    public string to { get; set; }

}

Also you're only getting one WorkGroupMetric per call, not an array of them so you should probably be using this:

WorkGroupMetric

not this

WorkGroupMetric[]

throughout